Material Name: Carbon Tool Steel
Grade: T8A
Standard: GB / T 1298-1986
● Features and application:
The steel strength and high wear resistance than T8 and T9, but the hot hardness is low, not high hardenability and hardening deformation. Suitable for the manufacture of cutting conditions are poor, higher wear resistance, and is not a sudden and severe vibrations, requires a certain toughness and a sharp knife-edge tools, such as turning, planing, drilling, cutting machine, precision and low profile simple measuring tools (such as card board, etc.), can be used without a large impact on the wear of zero
● Chemical Composition:
Carbon C: 0.95 ~ 1.04
Si Si: ≤ 0.35
Manganese Mn: ≤ 0.40
Sulfur S: ≤ 0.020
Phosphorus P: ≤ 0.030
Chromium Cr: promised to the residual content of ≤ 0.25, ≤ 0.10 (when manufacturing lead bath quench wire)
Ni: to promise the residual content of ≤ 0.20, ≤ 0.12 (when manufacturing lead bath quench wire)
Copper Cu: agreed to the residual content of ≤ 0.30, ≤ 0.20 (when manufacturing lead bath quench wire)
Note: The promise of residual content of Cr Ni Cu ≤ 0.40 (when manufacturing lead bath quench wire)
● Mechanical Properties:
Hardness: Annealed, ≤ 197HB, indentation diameter ≥ 4.30mm; quenching, ≥ 62HRC
● Heat treatment and microstructure specifications:
Heat treatment specifications: sample quenching 760 ~ 780 ℃, water-cooled.
● Delivery status: the status of delivery of steel to annealing. By mutual agreement, delivery can not annealed